Mechanical hammer.



. G. H. COATES.

MECHANICAL HAMMER.

APPLICATION FILED MAR. 21, 1910.

l 1 24,39 3.. Patented Jan. 12, 1915.

2 SHEETS-SHEET 1.

. (COO/63 G. H. COATES.

MECHANICAL HAMMER.

APPLICATION FILED 111111.21, 1910.

Patented Jan. 12, 1915.

2 SHEETS-SHEET 2.

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GEOBGE H, COATES, F WORCESTER, MASSACHUSETTS.

MECHANICAL HAMMER.

Specification of Letters Patent.

Patented Jan. 12,1915.

' Application filed March 21, 1910. Serial No. 550,595.

To all whom it may concern .Be it known that I, Gnonon H. COATES, a -citizen of the United States, residing at Worcester, in the county of Worcester and Commonwealth of Massachusetts, have invented a new and useful Improvement in Mechanical Hammers, of which the following is a specification, accompanied by drawings forming a part of the same.

The object of my present'invention is to produce a mechanicalhammer "in which a rotative force may be applied to produce a succession of blows without the use of cams, and in the present instance I have shown my 5 invention as applied to a hammer adapted to be held in the hand, in which the force of the blows may be applied to a chisel, riveting tool, or the like, and my invention.

' consists in the construction and arrangement of parts as hereinafter described and pointed out in the annexed claims.

Referring to the accompanying drawings, Figure l is a side view of a hammer embodying my present invention. Fig. 2 is a side view shown in vertical section on the plane of the broken line 2-2, Fig. 3. Fig. 3 is a sectional view through the inclosing case looking to the right on the plane of the broken line 3-3, Fig. 2, the mechanism contained in the case being shown in full. Fig.

4 is a detached perspective view of one of the hammers. Fig. ,5 is a sectional .view through the inclosing case,.looking to the right, on the plane of the broken line 5-5, Fig. 6 is a sectional view through the inclosing case, looking to the right, on the plane of the broken line 2-2, Fig. 2, the mechanism contained in the case being shown in full.

Similar reference characters refer to similar parts in the different figures.

Referring to the accompanying drawings 1 denotes a circular shell or case, provided on one side with a handle 2 to adapt the implement to be held in the hand of the operator, and provided on its opposite side with a cylindrical socket 3 containing a bushing 4 in which is inserted a. shank 5 of a chisel 6, or other tool, adapted to receive the impact of thehainmers.

Contained within the case 1 is a circular frame 7 attached to a spindle 8 journaled at opposite ends in-the case 1 and carrying a gear 9 which is engaged by a pinion 10 carried upon a short shaft 11. to which rotary motion may be imparted in any con venient method, preferably by means of a flexible shaft having its end engaging a tenon 12.

Pivoted at 13, 14 nearthe periphery of the frame 7 and on diametrically opposite sides of the frame is a pair of hammers 15, I6

due to the rapid rotation of the frame 7.

As the frame 7 is rotated the hammers will "successively strike against the end 17 of the chisel asshown in Fig. 2, in which the hammer 15 1s represented in contact with the end of the chisel 6. When one of the hammers is in contact with the end of the chisel,

the axis of the chisel extended passes through the pivotal axis of the other hammer, and a line connecting the centers of the pivots 13 and 14 passes through the center of the spindle 8. The handles of the hammers are, therefore, nearly as long as the diameter of the revolving frame 7, causing the hammer to move in an arc of long radius and in a path nearly tangential to the axial line of the chisel. The frame being rotated in the direction of the arrow 18, Fig. '2, the hammer 15 will be pushed back by its con tact with the end 17 of the chisel into the position of the hammer 16. allowing the hammer 15 to pass the end 17 of the chisel. but before the hammers have again reached the position of the hammer 15 they will be thrown out by centrifugal force so as to be brought into contact with the end 17 of the chisel. A'succession of blows will therefore be struck by each of the hammers 15 and 16 in succession, the faces 19 and 20 of the hammers being brought into a position substantiallv parallel with the end 17 of the chi el at the period of impact.

The hammers 15 and 16 are provided with shoulders 21 and 22 which limit the swing-.

ing movements of the hammers by their contacts with the opposite sides 26 and 27 of a pair of recesses 23 formed in the rotatable frame 7. The head and pivot of each ham inner surface of the shell. The friction of the hammers as they rubbed along the shell would require a considerableincrease in the ower necessary to rotate the hammers.

he sides or stops 26, however, are so positioned as to engage the shoulders 21 and 22 so as to sto the hammers just before they touch the s ell andin proper position to.

strike the tool as they rotate. The stops or sides 27 of the recesses serve to limit the rebound of the hammers after they have struck the tool.

frame having a recess at one side of the hammer, and the hammer having a shoulder projecting from one of its sides into said recess, whereby the opposite sides of the recess act as stops to limit the throw of the ham- I mer. I

2. In a mechanical hammer, a shell having a tool socket at its periphery, a revoluble frame within the shell, and a hammer pivoted at one side of the frame and with its head at the opposite side thereof so as to swing beyond the edge of the frame to strike a tool in the tool socket, the hammer having a projecting shoulder and the frame being recessed to receive the shoulder and form a stop in the path of the shoulder to limit the v throw of the hammer away from the frame.

' GEORGE H. COATES. Witnesses: PENELOPE COMBERBAGH,

NELLIE WHALEN. 

